Hi Vipin , shiro.txt Thanks for sharing the steps , I landed up here finding ways to troubleshoot during configuration , I have configured the shiro.ini file (attached) but I am getting the below error. Please let me know if you can help me on this. Any help would be appreciated. I am trying to authenticate AD using PAM Ldap with Zeppelin. ERROR [2018-10-19 13:36:34,315] ({qtp2059904228-153} LoginRestApi.java[proceedToLogin]:172) - Exception in login: org.apache.shiro.authc.AuthenticationException: Authentication failed for token submission [org.apache.shiro.authc.UsernamePasswordToken - admin, rememberMe=false]. Possible unexpected error? (Typical or expected login exceptions should extend from AuthenticationException). at org.apache.shiro.authc.AbstractAuthenticator.authenticate(AbstractAuthenticator.java:214) at org.apache.shiro.mgt.AuthenticatingSecurityManager.authenticate(AuthenticatingSecurityManager.java:106) at org.apache.shiro.mgt.DefaultSecurityManager.login(DefaultSecurityManager.java:270) at org.apache.shiro.subject.support.DelegatingSubject.login(DelegatingSubject.java:256) <br> Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.jvnet.libpam.impl.PAMLibrary$pam_conv at org.jvnet.libpam.PAM.<init>(PAM.java:73) at org.apache.zeppelin.realm.PamRealm.doGetAuthenticationInfo(PamRealm.java:71) at org.apache.shiro.realm.AuthenticatingRealm.getAuthenticationInfo(AuthenticatingRealm.java:568) at org.apache.shiro.authc.pam.ModularRealmAuthenticator.doSingleRealmAuthentication(ModularRealmAuthenticator.java:180) at org.apache.shiro.authc.pam.ModularRealmAuthenticator.doAuthenticate(ModularRealmAuthenticator.java:267) at org.apache.shiro.authc.AbstractAuthenticator.authenticate(AbstractAuthenticator.java:198) ... 66 more <br> ... View more